Patents by Inventor Kenichi Kuwajima

Kenichi Kuwajima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Non-aqueous electrolytic solution containing additive for increasing capacity of lithium-ion cell and lithium-ion cell using same
    Patent number: 8580440
    Abstract: Disclosed are an additive for improving charge/discharge characteristics of a lithium-ion cell, a nonaqueous electrolytic solution containing the additive, and a lithium-ion cell using the additive and/or the nonaqueous electrolytic solution. The additive serves as a solvent for a fluorine resin, such as poly(vinylidene fluoride), which is incorporated as an adhesive in a positive electrode containing a lithium-transition metal oxide capable of absorbing and releasing lithium and a negative electrode containing a carbon material capable of absorbing and releasing lithium. The additive comprises three compounds selected, respectively, from a 2-pyrrolidinone compound group, a cyclic alkyl compound group, and a cyclic pentanone compound group.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: November 12, 2013
    Assignee: Japan Aerospace Exploration Agency
    Inventors: Xianming Wang, Yoshitsugu Sone, Kenichi Kuwajima
  • Nonaqueous electrolytic solution containing additive for increasing capacity of lithium-ion cell and lithium-ion cell using same
    Patent number: 8124284
    Abstract: Disclosed are an additive for improving charge/discharge characteristics of a lithium-ion cell, a nonaqueous electrolytic solution containing the additive, and a lithium-ion cell using the additive and/or the nonaqueous electrolytic solution. The additive serves as a solvent for a fluorine resin, such as poly(vinylidene fluoride), which is incorporated as an adhesive in a positive electrode containing a lithium-transition metal oxide capable of absorbing and releasing lithium and a negative electrode containing a carbon material capable of absorbing and releasing lithium. The additive comprises three compounds selected, respectively, from a 2-pyrrolidinone compound group, a cyclic alkyl compound group, and a cyclic pentanone compound group.
    Type: Grant
    Filed: March 10, 2006
    Date of Patent: February 28, 2012
    Assignee: Japan Aerospace Exploration Agency
    Inventors: Xianming Wang, Yoshitsugu Sone, Saburo Kuwajima, Kenichi Kuwajima
  • NON-AQUEOUS ELECTROLYTIC SOLUTION CONTAINING ADDITIVE FOR INCREASING CAPACITY OF LITHIUM-ION CELL AND LITHIUM-ION CELL USING SAME
    Publication number: 20110189547
    Abstract: Disclosed are an additive for improving charge/discharge characteristics of a lithium-ion cell, a nonaqueous electrolytic solution containing the additive, and a lithium-ion cell using the additive and/or the nonaqueous electrolytic solution. The additive serves as a solvent for a fluorine resin, such as poly(vinylidene fluoride), which is incorporated as an adhesive in a positive electrode containing a lithium-transition metal oxide capable of absorbing and releasing lithium and a negative electrode containing a carbon material capable of absorbing and releasing lithium. The additive comprises three compounds selected, respectively, from a 2-pyrrolidinone compound group, a cyclic alkyl compound group, and a cyclic pentanone compound group.
    Type: Application
    Filed: April 13, 2011
    Publication date: August 4, 2011
    Inventors: Xianming Wang, Yoshitsugu Sone, Saburo Kuwajima, Kenichi Kuwajima
  • Non-flammable nonaqueous electrolyte solution and lithium ion cell using same
    Patent number: 7341807
    Abstract: Disclosed are a non-flammable nonaqueous electrolyte solution and a lithium ion cell using the electrolyte solution. The non-flammable nonaqueous electrolyte solution comprises a ternary or higher-order compound additive, a high concentration of lithium salt and a phosphoric ester serving as a primary solvent. The lithium ion cell comprises a positive electrode containing a lithium transition metal oxide capable of absorbing and releasing lithium, a negative electrode containing a carbon-based material capable of absorbing and releasing lithium, and the above non-flammable nonaqueous electrolyte solution.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: March 11, 2008
    Assignee: Japan Aerospace Exploration Agency
    Inventors: Xianming Wang, Yoshitsugu Sone, Saburo Kuwajima, Kenichi Kuwajima
  • Non-flammable nonaqueous electrolyte solution and lithium ion cell using same
    Publication number: 20060240329
    Abstract: Disclosed are a non-flammable nonaqueous electrolyte solution and a lithium ion cell using the electrolyte solution. The non-flammable nonaqueous electrolyte solution comprises a ternary or higher-order compound additive, a high concentration of lithium salt and a phosphoric ester serving as a primary solvent. The lithium ion cell comprises a positive electrode containing a lithium transition metal oxide capable of absorbing and releasing lithium, a negative electrode containing a carbon-based material capable of absorbing and releasing lithium, and the above non-flammable nonaqueous electrolyte solution.
    Type: Application
    Filed: February 27, 2006
    Publication date: October 26, 2006
    Inventors: Xianming Wang, Yoshitsugu Sone, Saburo Kuwajima, Kenichi Kuwajima
  • Nonaqueous electrolytic solution containing additive for increasing capacity of lithium-ion cell and lithium-ion cell using same
    Publication number: 20060216613
    Abstract: Disclosed are an additive for improving charge/discharge characteristics of a lithium-ion cell, a nonaqueous electrolytic solution containing the additive, and a lithium-ion cell using the additive and/or the nonaqueous electrolytic solution. The additive serves as a solvent for a fluorine resin, such as poly(vinylidene fluoride), which is incorporated as an adhesive in a positive electrode containing a lithium-transition metal oxide capable of absorbing and releasing lithium and a negative electrode containing a carbon material capable of absorbing and releasing lithium. The additive comprises three compounds selected, respectively, from a 2-pyrrolidinone compound group, a cyclic alkyl compound group, and a cyclic pentanone compound group.
    Type: Application
    Filed: March 10, 2006
    Publication date: September 28, 2006
    Inventors: Xianming Wang, Yoshitsugu Sone, Saburo Kuwashima, Kenichi Kuwajima